android - Facebook Login from Nested Fragment not working - Activity result fragment index out of range -

my app structure follows

mainactivity(a viewpager contains 2 fragments - fragment 1 , fragment 2)

|  |--fragment 1 |         (viewpager several fragments      |          app tutorial/intro) | |--fragment 2           (single fragment have custom facebook login button) 

at first, onactivityresult nested fragment not getting called. found solution using following code

@override protected void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);     log.d(tag, "onactivityresult");     list<fragment> frags = getsupportfragmentmanager().getfragments();     if (frags != null) {         (fragment f : frags) {             if (f != null)                 handleresult(f, requestcode, resultcode, data);         }     } }  private void handleresult(fragment frag, int requestcode, int resultcode, intent data) {     if (frag instanceof loginfragment) { // custom interface no signitures         frag.onactivityresult(requestcode, resultcode, data);     }     list<fragment> frags = frag.getchildfragmentmanager().getfragments();     if (frags != null) {         (fragment f : frags) {             if (f != null)                 handleresult(f, requestcode, resultcode, data);         }     } } 

now onactivityresult in loginfragment called, not login. onactivityresult loginfragment

   @override public void onactivityresult(int requestcode, int resultcode, intent data) {     log.d(tag, "loginfragment onactivityresult");     callbackmanager.onactivityresult(requestcode, resultcode, data); } 

i have registered callback using

loginmanager.getinstance().registercallback onsuccess callback not hit. 

instead log stating following

w/fragmentactivity﹕ activity result fragment index out of range: 0x2face d/mainactivity﹕ onactivityresult d/loginfragment﹕ loginfragment onactivityresult   

how make sure login happens , callbacks work?

edit : on debugging issue, kept break point in onactivityresult callback of fragmentactivity class.

if (mfragments.mactive == null || index < 0 || index >= mfragments.mactive.size()) {             log.w(tag, "activity result fragment index out of range: 0x"                     + integer.tohexstring(requestcode));             return;         } 

mfragments.mactive == null false.

index< 0 false

index >= mfragments.mactive.size() true

i figured out.

i trying login nested fragment using

loginmanager.getinstance().loginwithreadpermissions(this,arrays.aslist ("public_profile", "user_friends")); 

instead, needed pass activity instead of fragment loginwithreadpermissions method.

therefore, correct way login in case is

        loginmanager.getinstance().loginwithreadpermissions(getactivity(),            arrays.aslist("public_profile", "user_friends"));